Changing system menu icon of JFrame

Hi,

I would like the icon for the system menu of a JFrame changed to my own custom icon. What I need to know is what kind of image file I need for the icon. Can a .GIF file do? And what resolution should it be?

Also, suppose my java application runs on a Windows system, and I want to create a custom desktop icon to launch my application. How do I make that icon? From what I can tell from a normal .EXE program, the icon is stored inside the .EXE file.